DQ250 Mechatronic Cloning Guide – CXX, EXX, FXX & MQB Hardware Compatibility

One of the most common questions we receive regarding the VW/Audi DQ250 (02E) DSG6 mechatronic is:

Can I clone my original DQ250 mechatronic into another hardware version?

Typical examples are:

• Can I clone 02E927770AD into 02E927770AJ?

• Can I clone 02E927770AJ into 02E927770AL?

• Can I replace an old CXX mechatronic with an FXX unit?

• Can an MQB DQ250 mechatronic be cloned like an older 02E unit?

The answer depends on the hardware generation of the TCU.

Important: This article is primarily about CLONING, not simply replacing or upgrading a mechatronic.

Cloning and reprogramming are not the same thing.

A donor mechatronic that cannot accept a direct clone may still be usable if it is programmed with the correct software for the vehicle.

DQ250 Hardware Generations

Over its lifetime, the DQ250 / DSG6 has used several different generations of mechatronic electronics.

For practical purposes, we normally divide them into:

The hardware number is extremely important when deciding whether a 1:1 clone is possible.

DQ250 CXX Hardware

The early DQ250 mechatronic units use a Motorola processor.

Common CXX hardware numbers include:

• 02E927770M

• 02E927770L

• 02E927770G

• 02E927770AD

• 02E927770AE

These units can usually be cloned between compatible CXX hardware versions.

However, before making a direct clone of a very old unit, it is worth checking whether using a newer software version or newer hardware generation would be a better solution.

Many early units — particularly M, L and G versions — were supplied with very old DSG software versions, often with software revisions below 1000.

In many applications, newer software revisions exist.

Example: VCDS Advanced Identification

An older unit may show identification similar to this:

Advanced Identification

Serial number:        0000050221xxxx
Identification:       TFK-030
Revision:             04004010
Date:                 21.02.05
Test stand number:    0000
Manufacturer number: 0065

Flash Status

Programming Attempts: 2
Successful Attempts:  2
Programming Status:   00000000
Required Conditions:  00000000
Flash Tool Code:      00200 785 01324
Flash Date:           00.00.00

Software:
0005

Misc.
Hardware number: 02E 927 770 AD
Lot Number:      C30
Type Lock:       0000

The C30 lot number is another indication of the older CXX hardware generation.

DQ250 EXX – 02E927770AJ

The next important generation is:

02E927770AJ

This was an early Infineon-based DQ250 TCU used for a relatively short period around 2008–2009.

It is an important hardware version because it should not be treated as interchangeable with CXX or FXX when performing a direct clone.

The simple rule for 02E927770AJ:

If you want to perform a direct clone of an AJ unit, use another 02E927770AJ.

For example:

02E927770AJ → 02E927770AJ
Direct cloning: YES

02E927770AJ → 02E927770AL
Direct 1:1 cloning: NO

This does not necessarily mean that an FXX mechatronic cannot be used in the vehicle.

It means that you should not simply copy the AJ contents directly into different hardware and expect it to work.

The replacement unit must instead be properly programmed with software designed for that hardware generation and vehicle application.

DQ250 FXX Hardware

The later and much more common Infineon generation is normally referred to as FXX.

Common hardware numbers are:

• 02E927770AM

• 02E927770AL

• 02E927770AT

These units are generally a much better choice when replacing older DQ250 electronics.

Compatible FXX units can normally be cloned within the same hardware family.

Examples:

02E927770AL → 02E927770AL
Direct cloning: YES

Compatible FXX hardware can also often be used as replacement hardware, provided that the correct firmware for the donor hardware and vehicle application is programmed into the TCU.

This distinction is important:

Cloning

Copying the contents of one TCU directly into another compatible TCU.

Replacement / Upgrade

Installing another hardware generation and programming it with the appropriate software for the car.

These are two completely different procedures.

DQ250 MQB Hardware

The latest generation of DQ250 mechatronic used on MQB vehicles is significantly different from the earlier 02E generations.

Common MQB hardware numbers include:

• 02E927770AQ

• 02E927770AS

• 02E927770AN

• 02E927770AR

These units use Infineon processors but introduce another major difference:

Immobilizer Data

Unlike the older DQ250 generations, MQB DQ250 units contain immobilizer-related data.

When performing a complete clone of an MQB DQ250 TCU, simply transferring one memory area is not enough.

For a proper clone, both:

• FLASH

• EEPROM

must be transferred correctly because the relevant immobilizer information is distributed between the memories.

This is one of the reasons why replacing an MQB DQ250 mechatronic requires more care than replacing an older DQ250 unit.

MQB hardware also differs electrically from the previous generations, including differences in gearbox sensor inputs.

For this reason, MQB should be treated as its own hardware platform rather than simply as another newer FXX unit.

DQ250 Cloning Compatibility – Quick Reference

The important words here are direct clone.

A ❌ in this table does not automatically mean that the donor mechatronic cannot be used.

It means that different hardware requires the correct firmware and programming procedure instead of blindly transferring the original contents.

Cloning vs Upgrading a DQ250 Mechatronic

This is where many people become confused.

Suppose the car originally has:

02E927770AJ

and you have a newer:

02E927770AL

The correct question is not:

Can I copy the complete AJ file into the AL?

The better question is:

Is there compatible FXX software for the AL hardware that matches this vehicle and gearbox configuration?

In many cases, the answer is yes.

This allows a newer mechatronic generation to replace an older one without trying to force incompatible software into different hardware.

As a general hardware evolution, DQ250 moved through:

CXX → EXX → FXX → MQB

When upgrading hardware, however, the TCU must use software intended for that particular hardware generation.

You cannot simply cross-flash complete CXX, EXX, FXX and MQB contents as if the hardware were identical.

Which DQ250 Software Do I Need?

Finding a physically compatible mechatronic is only half of the job.

The software must also match:

• Vehicle platform

• Engine

• Gearbox configuration

• Gear ratios

• Hardware generation

• Vehicle communication architecture

• Software family

• Applicable factory software revisions

Using software from another vehicle simply because the hardware number looks similar can result in:

• No communication

• Incorrect gearbox operation

• Coding problems

• Incorrect gear ratios

• Fault codes

• Failed basic settings

• Incorrect CAN communication

• Immobilizer problems on applicable units

If you do not know which software belongs to a particular vehicle, DSGFILES can identify the correct DSG software from the vehicle VIN and mechatronic hardware information.

DSG Software Finder by VIN

Provide us with:

• Vehicle VIN

• Current or replacement mechatronic hardware number

• Available software information

and we can identify the appropriate DSG software version for the vehicle.

The process is performed manually, not by an automated lookup system.

DQ250 Hardware Summary

CXX

02E927770M
02E927770L
02E927770G
02E927770AD
02E927770AE

Early Motorola generation.

EXX

02E927770AJ

Early Infineon generation. For direct cloning, use another AJ.

FXX

02E927770AM
02E927770AL
02E927770AT

Later Infineon generation and commonly used as replacement hardware when correctly programmed.

MQB

02E927770AQ
02E927770AS
02E927770AN
02E927770AR

MQB generation with immobilizer data. Complete cloning requires both FLASH and EEPROM.

Need Help With a DQ250 Replacement Mechatronic?

If you have a defective DQ250 mechatronic and are unsure whether your donor unit is compatible, do not flash random files based only on the part number.

Send us:

Original hardware number + donor hardware number + VIN + current software identification

and we can determine the appropriate software or adaptation method.

DSGFILES.com — DSG / TCU Software, Programming & Gearbox Calibration